Iroquois County, Illinois
Iroquois County: county in Illinois, United States
About
Iroquois County is a county located in the U.S. state of Illinois. As of the 2010 census, the population was 29,718 and a population density of 10 people per km². After 10 years in 2020 county had an estimated population of 26,711 inhabitants. Its county seat is Watseka. The county was created 193 years ago in 1832.
County Snapshot
Iroquois County at a glance
Iroquois County currently has 23 quality-checked populated place pages linked on MapSof, making it easier to jump from the county overview into local city pages.
Mapped populated places
23
These counts use a stricter populated-place filter so the main lists stay focused on real city and town pages.
Illinois counties
102
Open related pagesLargest city
WatsekaPopulation 4,694
Top linked places
Quick Facts about Iroquois County
| Population | 26,711 (2020) |
| Country | United States of America |
| State | Illinois (United States) |
| Area | 2896 km2 |
| Water as percent of area | 0.1% |
| Land as percent of area | 99.9% |
| Latitude & Longitude | 40.7472,-87.8243 |
| Named for | Iroquois River |
| Altitude | 653 feet / 199 meters |
| Capital | Watseka |
| Establishment | January 01, 1833 |
| Time Zone | America/Chicago |
| Local time | 21:05:54 (18th April 2026) |
| Density | 9 Pop. per km² as of 2020 |
| Population growth | -11.26% (2010-2020) |
| Weather | 61℉ Showers And Thunderstorms 7-days weather |
Geography
Iroquois County is located at 40°44'50"N 87°49'27"W (40.7472300, -87.8243000). It has 6 neighbors: Vermillion County, Ford County, Kankakee County, Benton County, Montgomery County and Newton County.
Iroquois County map
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The largest city of Iroquois County is Watseka with a population of 4,694. Other cities include, Gilman population 1,625, Onarga population 1,241, Sheldon population 935 and Crescent City population 547. See all Iroquois County cities & populated places.
Iroquois County Populated Places (more)
Cities, towns, neighborhoods & other populated places in Iroquois County.
| City Name | Population | Title |
|---|---|---|
| Watseka | 4,694 | City in and county seat of Iroquois County, Illinois, United States |
| Gilman | 1,625 | Human settlement in Iroquois County, Illinois, United States of America |
| Hallock | 1,532 | Township in Peoria County, Illinois |
| Clifton | 1,297 | Village in Chebanse Township, Iroquois County, Illinois, USA |
| Onarga | 1,241 | Village in Iroquois County, Illinois, United States of America |
| Milford | 1,155 | Village in Milford Township, Iroquois County, Illinois, United States of America |
| Sheldon | 935 | Human settlement in Iroquois County, Illinois, United States of America |
| Cissna Park | 771 | Village in Pigeon Grove Township, Iroquois County, Illinois, United States |
| Ashkum | 710 | Township in Iroquois County, Illinois |
| Crescent City | 547 | Village in Illinois, United States |
| Danforth | 542 | Township in Iroquois County, Illinois |
| Buckley | 528 | Human settlement in Iroquois County, Illinois, United States of America |
| Loda | 396 | Township in Iroquois County, Illinois |
| Martinton | 338 | Township in Iroquois County, Illinois |
| Fountain Creek | 327 | Township in Iroquois County, Illinois |
| Beaverville | 319 | Township in Iroquois County, Illinois |
Weather
Showers and thunderstorms. Partly sunny, with a high near 61. Chance of precipitation is 90%.
7-Day ForecastOfficial website of Iroquois County
Official WebsiteDemographics
According to census records, the population of Iroquois County decreased by 11.26% in 10 years.
| Year | Population | % Change | Method |
|---|---|---|---|
| 2010 | 29,718 | - | census |
| 2011 | 29,500 | -0.74% | estimation process |
| 2012 | 29,267 | -0.8% | estimation process |
| 2013 | 28,940 | -1.13% | estimation process |
| 2014 | 28,719 | -0.77% | estimation process |
| 2015 | 28,522 | -0.69% | estimation process |
| 2016 | 28,163 | -1.27% | estimation process |
| 2017 | 27,777 | -1.39% | estimation process |
| 2018 | 27,484 | -1.07% | estimation process |
| 2019 | 27,114 | -1.36% | estimation process |
| 2020 | 26,711 | -1.51% | estimation process |
People born in Iroquois County (3)
People born in Iroquois County, including U.S. botanist, botanical collector and scientific illustrator Mary Agnes Chase, politician E. B. Dean, Edmund Hanson, .
More notable people
Illinois Other Counties (more counties)
| County Name | Population | Title |
|---|---|---|
| Cook County | 5,108,284 | County in Illinois, United States |
| Chicago | 2,677,643 | The third most populous city in the United States and the center of the Chicago metropolitan area. |
| DuPage County | 917,481 | County in Illinois, United States |
| Lake County | 693,593 | County in Oregon, United States |
| Will County | 688,726 | County in Illinois, United States |
| Kane County | 531,010 | County in southern Utah, United States |
| McHenry County | 305,888 | County in Illinois, United States |
| Winnebago County | 281,295 | County in Illinois, United States |
| Madison County | 262,635 | County in Montana, United States |
| Saint Clair County | 258,046 | The County of St. |
| Champaign County | 209,192 | County in Illinois, United States |
| Aurora | 196,383 | The second most populous city in Illinois. |
| Sangamon County | 193,882 | County in Illinois, United States |
| Peoria County | 177,652 | County in Illinois, United States of America |
| McLean County | 171,256 | County in North Dakota, United States |
| Naperville | 147,986 | The second most populous city in Illinois. |